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Pirama Arumuga Nainar 32530669f1 [LTO] Drop non-prevailing definitions only if linkage is not local or appending

Summary:
This fixes PR 37422

In ELF, non-weak symbols can also be non-prevailing.  In this particular
PR, the __llvm_profile_* symbols are non-prevailing but weren't getting
dropped - causing multiply-defined errors with lld.

Also add a test, strong_non_prevailing.ll, to ensure that multiple
copies of a strong symbol are dropped.

To fix the test regressions exposed by this fix,
- do not mark prevailing copies for symbols with 'appending' linkage.
There's no one prevailing copy for such symbols.
- fix the prevailing version in dead-strip-fulllto.ll
- explicitly pass exported symbols to llvm-lto in fumcimport.ll and
funcimport_var.ll

Reviewers: tejohnson, pcc

Subscribers: mehdi_amini, inglorion, eraman, steven_wu, dexonsmith,
dang, srhines, llvm-commits

Differential Revision: https://reviews.llvm.org/D54125

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346436 91177308-0d34-0410-b5e6-96231b3b80d8

2018-11-08 20:10:07 +00:00

Inputs

[ThinLTO] Fix test to require asserts

2018-10-17 00:19:21 +00:00

adjustable_threshold.ll

Move summary creation out of llvm-as into opt

2016-04-12 21:35:18 +00:00

funcimport_alias.ll

Move summary creation out of llvm-as into opt

2016-04-12 21:35:18 +00:00

funcimport_cutoff.ll

[ThinLTO] Add an import cutoff for debugging/triaging